Cognomen 亿贞 (亿贞 
) , in all the world, is a very rare family name. The surname 亿贞 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 亿贞 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 亿贞 | China |